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The cytoplasmic pH value of guard cells of Valerianella locusta was determined from the distribution of the weak acid [ 14 C]ABA between the medium and the cell, which was shown to be 8.1 ± 0.1. Treatment of guard cells in media with low pH (pH 5.0) and different concentrations of sodium acetate (0 − 5 mol m −3 ) caused a considerable acidification of the cytoplasm (6.6 − 7.7). Using the compartmental analysis we determined also the fluxes of ABA at the plasma membrane of guard cells (Φ ω ) and at the tonoplast of guard cells (Φ ᴄᴠ ) under steady state conditions. The flux of ABA from the cytoplasm into the vacuoles (tonoplast flux) was dependent upon the cytoplasmic pH. The data give evidence that ABA −  is transported across the tonoplast by a saturable transport component. The ABA flux at the plasma membrane seemed to be independent of the cytoplasmic pH.

Cytoplasmic pH and Abscisic Acid Transport across Guard Cell Membranes